reactor

noun

• 1 (also nuclear reactor) an apparatus or structure in which fissile material can be made to undergo a controlled, self-sustaining nuclear reaction with the consequent release of energy.
• a container or apparatus in which substances are made to react chemically, especially one in an industrial plant.

• 2 Medicine a person who shows an immune response to a specific antigen or an adverse reaction to a drug or other substance.

• 3 Physics a coil or other component which provides reactance in a circuit.